The April 2017 Developer Build for Couchbase Server 5.0 introduces numerous bug fixes and feature enhancements, bringing the release closer to its stable version. Key updates include enhancements to Role-Based Access Control (RBAC), improvements in N1QL query performance, and the introduction of Global Secondary Index (GSI) replicas and rebalancing capabilities. The build is also compatible with new platforms such as Oracle Linux 7, Ubuntu 16.04, and Windows Server 2016, while support for Ubuntu 12 is being phased out. The update addresses critical and major bugs affecting various features like ephemeral buckets, Full-Text Search (FTS), and N1QL operations, among others. Developers are encouraged to download the build and provide feedback through Couchbase's web console, forums, or directly via email or Twitter, helping to refine the software before its final release.